Recherche avancée

Sur d’autres sites (8302)

• How to concat two/many mp4 files(Mac OS X Lion 10.7.5) with different resolution, bit rate [on hold]

  3 septembre 2013, par praveen

  I have to concat different mp4 files into single mp4 file. i am using following ffmpeg command but this command is only working if both file is same(copy, or if all video property is same(codec, resolution,bitrate....) ) other wise result is unexpected video. (I am working on Mac OS X Lion 10.7.5)

  ffmpeg commad :

  ffmpeg -i images/1/output.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
  
  ffmpeg -i images/1/Video2.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
  
  ffmpeg -i "concat:intermediate1.ts|intermediate2.ts" -c copy -bsf:a aac_adtstoasc output2.mp4

  console output :

  [mpegts @ 0x7f8c6c03d800] max_analyze_duration 5000000 reached at 5000000 microseconds
  
  
  
  Input #0, mpegts, from 'concat:intermediate1.ts|intermediate2.ts':
  
  Duration: 00:00:16.52, start: 1.400000, bitrate: 1342 kb/s
  
  Program 1 
  
  Metadata:
  
  service_name    : Service01
  
  service_provider: FFmpeg
  
  Stream #0:0[0x100]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 1024x768 [SAR   1:1 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x101](und): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 101 kb/s
  
  
  
  
  
  
  
  Output #0, mp4, to 'output2.mp4':
  
  Metadata:
  
  encoder         : Lavf54.63.104
  
  Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 1024x768 [SAR 1:1 DAR 4:3],      q=2-31, 25 fps, 90k tbn, 90k tbc
  
  Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 101 kb/s
  
   Stream mapping:
  
  Stream #0:0 -> #0:0 (copy)
  
  Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
   frame=  586 fps=0.0 q=-1.0 Lsize=    2449kB time=00:00:20.11 bitrate= 997.4kbits/s    
  
   video:2210kB audio:225kB subtitle:0 global headers:0kB muxing overhead 0.578335%

  Please help

• ffmpeg : jpeg-images with different resolution -> video sequence ; using padding instead of scaling [on hold]

  3 septembre 2013, par user2742503

  I am currently struggling with the following problem using ffmpeg : I have a bunch of jpg-files with different resolution (say, one is 320x240, one is 800x600 etc) and want to create an avi-file using mjpeg as a video codec withn a output-video resolution of 800x600. The images itself should not be scaled in any way, that means : What I want to achieve is to just place the image in the center and fill the remaining space with white or black instead of scaling up the smaller images to the target resolution.

  So far I have used

  ffmpeg -f image2 -r 1 -i image_%04d.jpg -vcodec mjpeg -s 1920x1080 -qscale 2 -r 25 output2.avi

  or

  ffmpeg -f image2 -r 1 -i image_%04d.jpg -vcodec mjpeg -vf scale=1920:1080 -qscale 2 -r 25 output2.avi

  in case of scaling to HD resolution.

  Would be very thankful for any support on that !

  Thank you in advance !

• AAC's converted from CAFs for HTTP Live Streaming

  13 mars 2014, par user2901994

  I have several AAC files that were converted from CAF files, for use in HTTP Live Streaming. The stream works, however there is a small gap between each AAC file. It is my understanding that this gap is caused by the "Priming" and "Remainder" frames that are attached to AAC files when they are transcoded from CAFs.

  My question is, is there any way to remove this gap ? Or use FFMpeg to wrap the files, (possibly in m4a ?) so that audio players (VLC, JWPlayer) will understand to skip the gap ?